Geo location from a single field

I am trying to load the geo location data, using a single field.
How can I dis using a single location field with comma separated lat, lon.

example
location
-40.345, 23.993
-45.345, 23.945
-20.345, 23.993

Here is the mapping I used:

curl -XPOST http://localhost:9200/ats_member_locations -d '{"mappings":{"ats_locations":{"properties":{"latitude":{"type":"geo_point"}, "longitude":{"type":"geo_point"}}}}}'

Here is my config:

input{
        file{
                path => "/home/ubuntu/torched_products_addresses_work.csv"
                type => "ats_locations"
                start_position => "beginning"
                sincedb_path =>"/dev/null/"
        }
}

filter{
        csv{
                columns =>["location"]
                separator=>","
        }


mutate {
rename => [ "location", "[location][lat],[location][lon]" ]

}

}


output{

 elasticsearch {
                index=>"ats_member_locations"
                hosts => ["localhost:9200"]
        }

stdout { codec => rubydebug }

}

I just realized I am attempting two fields in the mapping.
be right back!

I have points on the map by using this mapping:

curl -XPOST http://localhost:9200/ats_member_locations -d '{"mappings":{"ats_locations":{"properties":{"location":{"type":"geo_point"}}}}}'